In a bowl, combine the carrots, celery, cheese, tomatoes, peppers, green onion, sunflower seeds, eggs and avocados, tossing to mix thoroughly. Filling can be prepared several hours ahead and refrigerated. To serve, let each person arrange filling 1 of the prepared quesadillas, then garnish with some of the Raita Sauce, and perhaps a drizzle of vinegar (which adds a nice whang).